Subjects exposed to green lighting complained of fatigue, sleepiness, and lack of energy, but blue lighting has reverse effect. Those exposed to blue lighting said they felt more energy and alertness.

"These results contribute to our understanding of how light impacts the brain and open up a new range of possibilities for using light to improve human alertness, productivity and safety," explained Steven Lockley, PhD, of Brigham and Women's Hospital and senior investigator of the study. "While helping to improve alertness in night workers has obvious safety benefits, day shift workers may also benefit from better quality lighting that would not only help them see better but also make them more alert." The challenge will be in providing blue lighting in the areas and fields of productivity where it would prove to be beneficial.

"I work with different frequencies of light to optimize my waking/sleeping cycle and to feel more refreshed upon waking and focused during the day. To give myself a boost, I expose myself to an extra dose of blue light with a Philips goLITE BLU Light Therapy Device.

For better sleep, I cut down on exposure to blue spectrum light toward the end of the day so that my body produces more melatonin. I turn off all lights and electronic devices or put on a pair ofblue light blocking glasses at least an hour before going to bed. In my experience, the results have been dramatic."